WO2017154361A1 - Stationary induction electrical apparatus - Google Patents

Stationary induction electrical apparatus Download PDF

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Publication number
WO2017154361A1
WO2017154361A1 PCT/JP2017/001623 JP2017001623W WO2017154361A1 WO 2017154361 A1 WO2017154361 A1 WO 2017154361A1 JP 2017001623 W JP2017001623 W JP 2017001623W WO 2017154361 A1 WO2017154361 A1 WO 2017154361A1
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WO
WIPO (PCT)
Prior art keywords
winding
support member
corner
periphery
iron core
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PCT/JP2017/001623
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French (fr)
Japanese (ja)
Inventor
誉大 佐竹
佐々木 康二
哲也 福山
亮 西水
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株式会社日立製作所
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Publication of WO2017154361A1 publication Critical patent/WO2017154361A1/en

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/30Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/28Coils; Windings; Conductive connections
    • H01F27/32Insulating of coils, windings, or parts thereof
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00Fixed transformers not covered by group H01F19/00
    • H01F30/06Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10Single-phase transformers

Definitions

  • the present invention relates to a static induction appliance.
  • Windings in static induction machines such as transformers and reactors are configured by winding one or several wires made of copper as a main material and winding them in a cylindrical shape.
  • a large current several times to several tens of times the normal amount flows, and an excessive electromagnetic mechanical force is instantaneously generated in the winding of the static induction machine due to this short circuit current.
  • a large repulsive force acts between the inner winding and the outer winding.
  • the iron core is a cylinder, or when the iron core is approximately cylindrical and the winding circumference is circular, a sufficient space factor can be secured, the electromagnetic mechanical force is evenly distributed by using the cylindrical winding.
  • the space factor refers to the ratio of the cross-sectional area of the iron core to the inner cross-sectional area of the winding.
  • Patent Document 1 a spacer member is arranged in a linear space between the inner winding of the transformer and the iron core, and resists the compressive force that causes the inner winding to be recessed toward the iron core (inner side) during a short circuit.
  • a winding support structure is disclosed (see FIG. 1, paragraph 0013 of Patent Document 1).
  • the electromagnetic mechanical force at the time of a short circuit is supported by the iron case through a spacer member disposed between the covering material of the iron case and the inner winding. It has become. According to this technique, it is possible to establish a winding of a static induction electric machine having a relatively small electromagnetic mechanical force at the time of a short circuit.
  • an amorphous iron core is formed by laminating thin ribbons of an amorphous alloy that is thinner than a silicon steel plate, the cross-sectional shape of the amorphous iron core must be rectangular from the viewpoint of manufacturability. Therefore, unlike the conventional high-voltage (hereinafter referred to as “extra-high”) class static induction electric appliances in which the cross-sectional shape of the iron core is circular or substantially circular, the winding shape of the winding must be square or racetrack. I do not get. This is because, from the viewpoint of securing the above-described space factor, it is difficult to adopt a cylindrical winding that can receive an electromagnetic mechanical force at the time of a short circuit due to the drag of the winding itself.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to further suppress deformation of a winding at the time of a short circuit in a static induction electric machine including an iron core having a rectangular cross section.
  • a static induction electric machine includes an iron core having a rectangular cross section, an inner winding arranged concentrically around the iron core, and a concentric shape around the inner winding.
  • the outer winding is disposed between the inner winding and the outer winding, and is formed of an insulating material that supports the outer circumference of the inner winding and the inner circumference of the outer winding.
  • a support member, and the inner and outer windings are opposed to each other by a pair of parallel straight portions formed in a straight line when viewed from a direction along the axis of the iron core.
  • connection portions that connect the end portions to each other via a corner portion, and the connection portions are formed in a straight line shape or an outwardly convex curve shape, and the support member is formed of the corner portion. It has the corner support member which contact
  • the deformation of the winding at the time of a short circuit can be further suppressed in a static induction electric machine including an iron core having a rectangular cross section.
  • FIG. 1 It is a schematic perspective view which shows the external appearance of the transformer which concerns on 1st Embodiment of the static induction appliance of this invention. It is a horizontal sectional view of the vicinity of the winding of the transformer shown in FIG. It is sectional drawing of the inner side winding support member which concerns on a modification. It is an expanded sectional view of the corner support member vicinity shown by FIG. It is a schematic diagram for demonstrating the deformation
  • FIG. 1 is a schematic perspective view showing an appearance of a transformer 100 according to a first embodiment of a static induction electric appliance of the present invention.
  • a single-phase tripod transformer 100 will be described as an example.
  • the transformer 100 has an iron core 1.
  • the iron core 1 has a main leg portion 11 disposed at the center and side leg portions 12 and 12 disposed on both sides thereof, and the main leg portion 11 and the side leg portions 12 are integrated in the upper part and the lower part. Connected.
  • the side legs 12 are covered with a case.
  • the transformer 100 includes a winding 2 disposed concentrically around the main leg portion 11 of the iron core 1. That is, the iron core 1 is disposed through the inside of the winding 2.
  • the transformer 100 is configured such that the entire structure including the iron core 1 and the winding 2 is supported by a support frame 101.
  • FIG. 2 is a horizontal sectional view of the vicinity of the winding 2 of the transformer 100 shown in FIG.
  • the iron core 1 is an amorphous iron core configured by laminating thin ribbons of amorphous alloy to reduce loss. For this reason, the iron core 1 has a rectangular cross section. In addition, the iron core 1 may be divided
  • the winding 2 includes an inner winding 3 arranged concentrically around the main leg 11 of the iron core 1 and an outer winding 4 arranged concentrically around the inner winding 3. ing.
  • the inner winding 3 is wound and arranged on the outer side in the radial direction of the iron core 1 (direction perpendicular to the axis L of the main leg portion 11 of the iron core 1). It is wound and arranged on the outside in the radial direction.
  • the axis L is a straight line passing through the center (centroid) of the cross section of the iron core 1 shown in FIG. 2 and perpendicular to the cross section.
  • the inner winding 3 is configured as a low voltage side winding (secondary side winding)
  • the outer winding 4 is configured as a high voltage side winding (primary side winding).
  • the inner winding 3 is a pair of parallel straight portions 31 formed in a straight line when viewed from a direction along the axis L of the main leg portion 11 of the iron core 1 (vertical direction; a direction perpendicular to the paper surface of FIG. 2). And a pair of connecting portions 33 that connect opposite end portions of the respective straight line portions 31 via the corner portions 32.
  • the outer winding 4 includes a pair of parallel straight portions 41 formed in a straight line when viewed from the direction along the axis L of the main leg portion 11 of the iron core 1, and opposite end portions of the straight portions 41. And a pair of connection portions 43 that connect each other via the corner portion 42.
  • the connecting portions 33 and 43 are formed in an outwardly convex arc shape. That is, the winding shape of the winding 2 (the inner winding 3 and the outer winding 4) is a racetrack type.
  • the straight portions 31 and 41 are parallel to the long side of the rectangular cross section of the iron core 1.
  • the connecting portions 33 and 43 are arc portions having a large radius corresponding to the short side of the rectangular cross section of the iron core 1.
  • the corner portions 32 and 42 are arc portions having a small radius located between the straight portions 31 and 41 and the connection portions 33 and 43.
  • an inner / outer winding support member (support member) 5 that supports the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 is disposed.
  • the support member 5 between the inner and outer windings has a strip shape (band plate shape) and extends in a direction along the axis L of the main leg portion 11 of the iron core 1.
  • the support member 5 between the inner and outer windings is made of an insulating material.
  • the material of the support member 5 between the inner and outer windings is, for example, a press board (paper), but is not limited thereto, and is an insulating material such as insulating wood, insulating resin (ebonite, etc.). May be.
  • the inner / outer winding support member 5 includes a corner support member 6 that contacts the corner portions 32 and 42 and an inter-corner support member 7 that contacts the straight portions 31 and 41 or the connection portions 33 and 43.
  • the corner support member 6 is disposed separately for each of the corner portions 32 and 42 located at four locations.
  • the support member 7 between corners is arrange
  • the space between the adjacent inner / outer winding support members 5 (corner support member 6 and inter-corner support member 7) in the circumferential direction of the winding 2 is an insulating oil for cooling the winding 2 ( It can function as an oil passage through which insulating oil flows.
  • the inner / outer winding support member 5 includes inner portions 61 and 71 disposed on the inner winding 3 side (inner side) of the insulating tube 51 and outer windings of the inner portions 61 and 71 with the insulating tube 51 interposed therebetween. And outer portions 62 and 72 arranged on the four sides (outside).
  • the outer winding 4 is wound on the inner / outer winding support member 5 in a state in which the inner / outer winding support member 5 is set together with the insulating cylinder 51 outside the inner winding 3.
  • an inner winding support member 8 that supports the inner circumference of the inner winding 3 over the entire circumference is disposed.
  • the inner winding support member 8 also has a generally racetrack shape.
  • the inner winding support member 8 is made of an insulating material. As the material of the inner winding support member 8, for example, the same material as that of the inner / outer winding support member 5 can be used.
  • FIG. 3 is a cross-sectional view of an inner winding support member 8a according to a modification.
  • an oil passage 81 into which insulating oil for cooling the winding 2 flows is formed on the outer periphery of the inner winding support member 8a.
  • the oil passage 81 is, for example, a groove extending in the vertical direction (direction perpendicular to the paper surface of FIG. 3).
  • an outer winding support member 9 that supports the outer periphery of the straight portion 41 of the outer winding 4 is disposed outside the straight portion 41 of the outer winding 4.
  • the outer winding support member 9 is made of an insulating material.
  • the material of the outer winding support member 9 for example, the same material as that of the inner / outer winding support member 5 can be used.
  • the outer side of the outer winding support member 9 (the side opposite to the outer winding 4) is supported by a structure (not shown).
  • FIG. 4 is an enlarged cross-sectional view of the vicinity of the corner support member 6 shown in FIG.
  • the corner support member 6 includes a connection point 35 between the corner portion 32 and the straight portion 31 on the outer periphery 34 of the inner winding 3 and a corner portion 32 and a connection portion 33 on the outer periphery 34 of the inner winding 3. And a contact point 36.
  • the connection point 35 is a change point that changes from the corner portion 32 to the straight portion 31
  • the connection point 36 is a change point that changes from the corner portion 32 to the connection portion 33. is there.
  • the corner support member 6 includes a connection point 45 between the corner portion 42 and the straight portion 41 on the inner periphery 44 of the outer winding 4 and a connection between the corner portion 42 and the connection portion 43 on the inner periphery 44 of the outer winding 4. It is in contact with the point 46.
  • the connection point 45 is a changing point where the corner portion 42 changes to the straight portion 41
  • the connecting point 46 is a changing point where the corner portion 42 changes to the connecting portion 43. It is.
  • FIG. 5 is a schematic diagram for explaining the deformation of the winding 2 at the time of a short circuit.
  • the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 are mainly shown, and the corner support member 6 is not shown.
  • both the straight portion 31 and the connecting portion 33 which is a circular arc portion having a large radius tend to be deformed inward (schematically shown by a two-dot chain line in FIG. 5). Show).
  • the corner part 32 which is a circular arc part which has a small radius located between the linear part 31 and the connection part 33 tends to deform
  • both the straight portion 41 and the connecting portion 43 that is a circular arc portion having a large radius tend to be deformed outward (schematically indicated by a two-dot chain line in FIG. 5).
  • the corner part 42 which is a circular arc part which has a small radius located between the linear part 41 and the connection part 43 tends to deform
  • the corner portions 32 and 42 tend to deform in a direction in which the inner winding 3 and the outer winding 4 approach each other. At this time, a large stress is generated by the stress concentration at the corner portions 32 and 42, particularly at the connection points 35, 36, 45, and 46 (see FIG. 4). If the generated stress exceeds the allowable stress, excessive deformation occurs, and permanent deformation (plastic deformation) may remain even after the short circuit is resolved.
  • the corner support member 6 (see FIGS. 2 and 4) is disposed between the inner winding 3 and the outer winding 4, so that the corner portion 32 and the outer winding 4 of the inner winding 3 are arranged.
  • the function of suppressing the deformation of the corner portions 42 is exhibited.
  • FIG. 6 is a graph showing the relationship between the curvature radius ratio of the winding 2 and the stress generated at the time of short circuit. 6 represents the ratio (curvature radius ratio) P between the curvature radius R1 (see FIG. 2) of the corner portion 42 and the curvature radius R2 (see FIG. 2) of the connection portion 43 on the outer periphery of the outer winding 4. . Further, the vertical axis in FIG. 6 indicates the maximum stress ⁇ generated in the winding 2 at the time of short circuit. In FIG. 6, the curvature radius ratio P is indicated by a ratio value.
  • the maximum stress ⁇ generated at the time of short circuit becomes excessive. Even if the radius of curvature R1 of the corner portion 42 is too large, the maximum stress ⁇ generated at the time of short circuit tends to increase. More specifically, as shown in FIG. 6, the maximum stress ⁇ generated at the time of short circuit is considerably low when the radius-of-curvature ratio P is in the range of 1: 7 to 1: 4, and the radius-of-curvature ratio P is 1. : 5 is minimum. That is, the maximum stress ⁇ slightly decreases as the curvature radius ratio P goes from 1: 7 to 1: 5, and slightly increases as the curvature radius ratio P goes from 1: 5 to 1: 4. Therefore, it can be said that the curvature radius ratio P is preferably in the range of 1: 4 to 1: 7.
  • the transformer 100 includes the iron core 1 having a rectangular cross section, and the inner winding 3 and the outer winding 4 that have a racetrack shape as a circular shape. Between the inner winding 3 and the outer winding 4, an inner / outer winding support member 5 that supports the outer circumference 34 of the inner winding 3 and the inner circumference 44 of the outer winding 4 is disposed, The inner / outer winding support member 5 includes a corner support member 6 that abuts against the corner portions 32 and 42.
  • the deformation of the winding 2 at the time of a short circuit can be further suppressed. Thereby, it can suppress that characteristics, such as an impedance, deteriorate by the excessive deformation
  • the corner support member 6 is in contact with the connection points 35 and 36 on the outer periphery 34 of the inner winding 3 and the connection points 45 and 46 on the inner periphery 44 of the outer winding 4. According to such a configuration, the connection points 35, 36, 45, 46 of the winding 2, which are particularly prone to stress concentration, are supported by the corner support member 6, so that stress concentration is reduced.
  • the ratio P (curvature radius ratio) P between the curvature radius R1 of the corner portion 42 and the curvature radius R2 of the connection portion 43 on the outer periphery of the outer winding 4 is in the range of 1: 4 to 1: 7. is there.
  • the support member 5 between the inner and outer windings has the inner portions 61 and 71 disposed on the inner winding 3 side of the insulating tube 51 and the inner portions 61 and 71 with the insulating tube 51 interposed therebetween. And outer portions 62 and 72 arranged on the outer winding 4 side. According to such a configuration, the inner portions 61 and 71 and the outer portions 62 and 72 are respectively disposed inside and outside the insulating cylinder 51, thereby ensuring insulation between the inner winding 3 and the outer winding 4.
  • the workability of installing the support member 5 between the inner and outer windings can be improved. Furthermore, the space in which the supporting member 5 between the inner and outer windings inside and outside the insulating cylinder 51 is not disposed can function as an oil passage through which insulating oil for cooling the winding 2 flows.
  • an inner winding support member 8 that supports the inner circumference of the inner winding 3 over the entire circumference is disposed between the iron core 1 and the inner winding 3. According to such a configuration, it is possible to reliably support the inner winding 3 against an electromagnetic mechanical force that attempts to deform the inner winding 3 into the iron core 1 (inner side) at the time of a short circuit. Therefore, deformation of the inner winding 3 at the time of short circuit can be further suppressed.
  • the outer winding support member 9 that supports the outer periphery of the linear portion 41 of the outer winding 4 is disposed outside the linear portion 41 of the outer winding 4. According to such a configuration, the outer winding support member 9 reliably supports the linear portion 41 of the outer winding 4 against an electromagnetic mechanical force that attempts to deform the outer winding 4 outward during a short circuit. can do. Therefore, the deformation of the outer winding 4 at the time of a short circuit can be further suppressed.
  • FIG. 7 is an enlarged cross-sectional view of the vicinity of the corner support member 6a according to the second embodiment of the present invention.
  • the corner support member 6 a is divided in the circumferential direction of the winding 2 (the inner winding 3 and the outer winding 4), and has a first member 63 and a second member 64. ing.
  • the first member 63 has a connection point 35 between the corner portion 32 and the straight portion 31 on the outer periphery 34 of the inner winding 3 and a connection point 45 between the corner portion 42 and the straight portion 41 on the inner periphery 44 of the outer winding 4. It is in contact.
  • the second member 64 includes a connection point 36 between the corner portion 32 and the connection portion 33 on the outer periphery 34 of the inner winding 3 and a connection point between the corner portion 42 and the connection portion 43 on the inner periphery 44 of the outer winding 4. 46 abuts.
  • the corner support member 6 of the first embodiment has a long length in the circumferential direction of the winding 2 (the width direction of the strip-shaped corner support member 6) as shown in FIG.
  • the corner support member 6a of the second embodiment is divided into a first member 63 and a second member 64.
  • the corner support member 6a since the corner support member 6a has a short length in the circumferential direction of the winding 2, it is hardly necessary to form the curved shape, and the manufacture becomes easy.
  • the space between the first member 63 and the second member 64 in the circumferential direction of the winding 2 can function as an oil passage through which insulating oil for cooling the winding 2 flows.
  • FIG. 8 is a horizontal sectional view of the vicinity of the winding 2a of the transformer according to the third embodiment of the present invention.
  • the connecting portions 33a and 43a are formed in a straight line. That is, the winding shape of the winding 2a (the inner winding 3a and the outer winding 4a) is a square shape.
  • the inner winding support member 8b also has a square shape.
  • An outer winding support member 9a that supports the outer periphery of the connecting portion 43a of the outer winding 4a is disposed outside the linear connecting portion 43a of the outer winding 4a.
  • the outer winding support member 9a is made of an insulating material. As the material of the outer winding support member 9a, for example, the same material as that of the inner / outer winding support member 5 can be used.
  • the outer side of the outer winding support member 9a (the side opposite to the outer winding 4a) is supported by a structure (not shown).
  • the present invention can also be applied to a transformer including an iron core 1 having a rectangular cross section and a winding 2a (inner winding 3a and outer winding 4a) whose circular shape is a square shape.
  • the transformer 100 has been described.
  • the present invention is not limited to this, and can also be applied to other stationary induction devices such as a reactor.
  • the connecting portions 33 and 43 of the winding 2 are formed in an outwardly convex arc shape. There is no need, for example, a curved shape such as an elliptical arc may be used.
  • the corner support member 6a is divided into the first member 63 and the second member 64 in the circumferential direction of the winding 2 (see FIG. 7). It is not limited and may be divided into three or more.
  • the one corner support member 7 is arrange

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  • Coils Of Transformers For General Uses (AREA)
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Abstract

The objective of the invention is to suppress, in a stationary induction electrical apparatus equipped with an iron core having a rectangular cross-section, the deformation of a coil during a short circuit. In order to achieve this objective, a transformer serving as the stationary induction electrical apparatus according to the present invention comprises: an iron core 1 having a rectangular cross section; and an inner coil 3 and an outer coil 4, whereof the circling shape assumes an angular form or a race track form. Disposed between the inner coil 3 and the outer coil 4 is an inter-internal-external-coil supporting member 5 for supporting the outer periphery 34 of the inner coil 3 and the inner periphery 44 of the outer coil 4. The inter-internal-external-coil supporting member 5 has a corner supporting member 6 abutting corner portions 32, 42.

Description

静止誘導電器Static induction machine
 本発明は、静止誘導電器に関する。 The present invention relates to a static induction appliance.
 変圧器、リアクトルなどの静止誘導電器における巻線は、銅を主材料とした線材を一本から数本を束ねて巻き回し、筒状に積層して構成されている。静止誘導電器で短絡が起きると、通常の数倍から数十倍の大きな電流が流れ、この短絡電流によって静止誘導電器の巻線に過大な電磁機械力が瞬間的に発生する。具体的には、内側巻線と外側巻線との間に大きな反発力(ローレンツ力)が働く。鉄心が円柱の場合、もしくは鉄心が略円柱形状で巻線の周回形状が円形でも充分な占積率を確保できる場合には、円筒形の巻線を使用することで電磁機械力が均等に分散するため、巻線自身の抗力によって巻線の変形が抑制される。ここで、占積率とは、巻線の内側断面積に対して鉄心の断面積が占める割合をいい、占積率を高めることによって、磁束が漏れにくくなり効率が向上する。 Windings in static induction machines such as transformers and reactors are configured by winding one or several wires made of copper as a main material and winding them in a cylindrical shape. When a short circuit occurs in a static induction machine, a large current several times to several tens of times the normal amount flows, and an excessive electromagnetic mechanical force is instantaneously generated in the winding of the static induction machine due to this short circuit current. Specifically, a large repulsive force (Lorentz force) acts between the inner winding and the outer winding. When the iron core is a cylinder, or when the iron core is approximately cylindrical and the winding circumference is circular, a sufficient space factor can be secured, the electromagnetic mechanical force is evenly distributed by using the cylindrical winding. Therefore, deformation of the winding is suppressed by the drag of the winding itself. Here, the space factor refers to the ratio of the cross-sectional area of the iron core to the inner cross-sectional area of the winding. By increasing the space factor, the magnetic flux hardly leaks and the efficiency is improved.
 また、数キロVAクラスまでの容量の静止誘導電器では、鉄心の断面および巻線の周回形状が角型(矩形)であっても、簡易な支持で短絡時に発生する電磁機械力に抗することができる。 In addition, in static induction appliances with capacities up to several kilo VA class, even if the cross section of the iron core and the winding shape of the winding are square (rectangular), it can withstand the electromagnetic mechanical force generated at the time of short circuit with simple support. Can do.
 特許文献1には、変圧器の内側巻線と鉄心との間の直線状に形成された空間にスペーサ部材を配置し、短絡時に内側巻線を鉄心側(内側)に凹ませる圧縮力に抗する巻線支持構造が開示されている(特許文献1の図1、段落0013参照)。前記した特許文献1に記載の変圧器では、短絡時の電磁機械力が、鉄心のケースの被覆材と内側巻線との間に配置されたスペーサ部材を介して鉄心のケースで支持されるようになっている。この技術によれば、短絡時の電磁機械力が比較的小さい静止誘導電器の巻線を成立させることが可能である。 In Patent Document 1, a spacer member is arranged in a linear space between the inner winding of the transformer and the iron core, and resists the compressive force that causes the inner winding to be recessed toward the iron core (inner side) during a short circuit. A winding support structure is disclosed (see FIG. 1, paragraph 0013 of Patent Document 1). In the transformer described in Patent Document 1, the electromagnetic mechanical force at the time of a short circuit is supported by the iron case through a spacer member disposed between the covering material of the iron case and the inner winding. It has become. According to this technique, it is possible to establish a winding of a static induction electric machine having a relatively small electromagnetic mechanical force at the time of a short circuit.
特開2001-035727号公報Japanese Patent Laid-Open No. 2001-035727
 近年、静止誘導電器においては、環境負荷低減の観点から高効率化が求められており、これに用いられる鉄心についても、低損失化のためにアモルファス合金から構成されるアモルファス鉄心への置き換えが進んでいる。大型の電力変換用の静止誘導電器においてもこの要求は同様であり、アモルファス鉄心への置き換えの要求が高い。 In recent years, static induction electric appliances have been required to be highly efficient from the viewpoint of reducing environmental impact, and the iron cores used therefor have been replaced with amorphous iron cores composed of amorphous alloys in order to reduce loss. It is out. This requirement is the same for large-sized static induction electric appliances for power conversion, and there is a high demand for replacement with an amorphous iron core.
 ところで、アモルファス鉄心は珪素鋼板よりもさらに薄いアモルファス合金の薄帯を積層して構成されているため、その製造性の観点から、アモルファス鉄心の断面形状は矩形とならざるを得ない。したがって、鉄心の断面形状を円形もしくは略円形とする従来の特別高圧(以下、「特高」という)クラスの静止誘導電器と異なり、巻線の周回形状は、角型もしくはレーストラック型を採らざるを得ない。これは、前記した占積率を確保する観点から、巻線自身の抗力によって短絡時の電磁機械力を受け得る円筒形の巻線の採用が困難となるからである。 By the way, since an amorphous iron core is formed by laminating thin ribbons of an amorphous alloy that is thinner than a silicon steel plate, the cross-sectional shape of the amorphous iron core must be rectangular from the viewpoint of manufacturability. Therefore, unlike the conventional high-voltage (hereinafter referred to as “extra-high”) class static induction electric appliances in which the cross-sectional shape of the iron core is circular or substantially circular, the winding shape of the winding must be square or racetrack. I do not get. This is because, from the viewpoint of securing the above-described space factor, it is difficult to adopt a cylindrical winding that can receive an electromagnetic mechanical force at the time of a short circuit due to the drag of the winding itself.
 しかしながら、特高クラスの容量で、かつ円筒形の巻線を使用しない場合には、短絡時に巻線に作用する電磁機械力が過大となり、巻線が大きく変形してしまうおそれがある。そして、巻線が大きく変形すると、インピーダンスの変化率が大きくなり、1回の短絡事故で継続した使用が不可能となってしまう。 However, when a special-class capacity and a cylindrical winding are not used, the electromagnetic mechanical force acting on the winding during a short circuit may be excessive, and the winding may be greatly deformed. If the winding is greatly deformed, the rate of change in impedance becomes large, and it becomes impossible to continue use in a single short-circuit accident.
 本発明は、前記した事情に鑑みなされたものであり、矩形の断面を有する鉄心を備える静止誘導電器において短絡時の巻線の変形をより抑制することを課題とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to further suppress deformation of a winding at the time of a short circuit in a static induction electric machine including an iron core having a rectangular cross section.
 上記課題を達成すべく、本発明に係る静止誘導電器は、矩形の断面を有する鉄心と、前記鉄心の周囲に同心状に配置されている内側巻線と、前記内側巻線の周囲に同心状に配置されている外側巻線と、前記内側巻線と前記外側巻線との間に配置され、前記内側巻線の外周と前記外側巻線の内周とを支持する絶縁材料から形成された支持部材と、を備え、前記内側巻線および前記外側巻線は、前記鉄心の軸線に沿う方向から見て、直線状に形成されている一対の平行な直線部と、各直線部の対向する端部同士をコーナー部を介して接続する一対の接続部と、をそれぞれ有し、前記接続部は、直線状または外に凸の曲線状に形成されており、前記支持部材は、前記コーナー部に当接するコーナー支持部材を有することを特徴とする。 In order to achieve the above object, a static induction electric machine according to the present invention includes an iron core having a rectangular cross section, an inner winding arranged concentrically around the iron core, and a concentric shape around the inner winding. The outer winding is disposed between the inner winding and the outer winding, and is formed of an insulating material that supports the outer circumference of the inner winding and the inner circumference of the outer winding. A support member, and the inner and outer windings are opposed to each other by a pair of parallel straight portions formed in a straight line when viewed from a direction along the axis of the iron core. A pair of connection portions that connect the end portions to each other via a corner portion, and the connection portions are formed in a straight line shape or an outwardly convex curve shape, and the support member is formed of the corner portion. It has the corner support member which contact | abuts to, It is characterized by the above-mentioned.
 本発明によれば、矩形の断面を有する鉄心を備える静止誘導電器において短絡時の巻線の変形をより抑制することができる。 According to the present invention, the deformation of the winding at the time of a short circuit can be further suppressed in a static induction electric machine including an iron core having a rectangular cross section.
本発明の静止誘導電器の第1実施形態に係る変圧器の外観を示す概略斜視図である。It is a schematic perspective view which shows the external appearance of the transformer which concerns on 1st Embodiment of the static induction appliance of this invention. 図1に示される変圧器の巻線付近の水平断面図である。It is a horizontal sectional view of the vicinity of the winding of the transformer shown in FIG. 変形例に係る内側巻線支持部材の断面図である。It is sectional drawing of the inner side winding support member which concerns on a modification. 図2に示されるコーナー支持部材付近の拡大断面図である。It is an expanded sectional view of the corner support member vicinity shown by FIG. 短絡時の巻線の変形を説明するための模式図である。It is a schematic diagram for demonstrating the deformation | transformation of the coil | winding at the time of a short circuit. 巻線の曲率半径比と短絡時発生応力との関係を示すグラフである。It is a graph which shows the relationship between the curvature radius ratio of a coil | winding, and the stress generated at the time of a short circuit. 本発明の第2実施形態に係るコーナー支持部材付近の拡大断面図である。It is an expanded sectional view near the corner support member concerning a 2nd embodiment of the present invention. 本発明の第3実施形態に係る変圧器の巻線付近の水平断面図である。It is a horizontal sectional view near the coil | winding of the transformer which concerns on 3rd Embodiment of this invention.
 本発明の実施形態について、適宜図面を参照しながら詳細に説明する。 Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
 なお、各図において、共通する構成要素や同様な構成要素については、同一の符号を付し、それらの重複する説明を適宜省略する。
(第1実施形態)
 まず、図1~図6を参照しながら、本発明の第1実施形態について説明する。
In addition, in each figure, about the same component or the same component, the same code | symbol is attached | subjected and those overlapping description is abbreviate | omitted suitably.
(First embodiment)
First, a first embodiment of the present invention will be described with reference to FIGS.
 図1は、本発明の静止誘導電器の第1実施形態に係る変圧器100の外観を示す概略斜視図である。本実施形態では、単相三脚型の変圧器100を例に挙げて説明する。図1に示すように、変圧器100は、鉄心1を有している。鉄心1は、中央に配置された主脚部11と、その両側に配置された側脚部12,12とを有しており、主脚部11と側脚部12とは上部および下部において一体的に繋がっている。なお、側脚部12は、ケースで覆われている。また、変圧器100は、鉄心1の主脚部11の周囲に同心状に配置された巻線2を備えている。すなわち、鉄心1は、巻線2の内側を貫通して配置されている。そして、変圧器100は、鉄心1および巻線2を含む全体を支持枠101で支えて構成されている。 FIG. 1 is a schematic perspective view showing an appearance of a transformer 100 according to a first embodiment of a static induction electric appliance of the present invention. In the present embodiment, a single-phase tripod transformer 100 will be described as an example. As shown in FIG. 1, the transformer 100 has an iron core 1. The iron core 1 has a main leg portion 11 disposed at the center and side leg portions 12 and 12 disposed on both sides thereof, and the main leg portion 11 and the side leg portions 12 are integrated in the upper part and the lower part. Connected. The side legs 12 are covered with a case. Further, the transformer 100 includes a winding 2 disposed concentrically around the main leg portion 11 of the iron core 1. That is, the iron core 1 is disposed through the inside of the winding 2. The transformer 100 is configured such that the entire structure including the iron core 1 and the winding 2 is supported by a support frame 101.
 図2は、図1に示される変圧器100の巻線2付近の水平断面図である。図2に示すように、鉄心1は、低損失化のためにアモルファス合金の薄帯を積層して構成されているアモルファス鉄心である。このため、鉄心1は、矩形の断面を有している。なお、鉄心1は、矩形の断面の長辺において分割されていてもよい。巻線2は、鉄心1の主脚部11の周囲に同心状に配置されている内側巻線3と、内側巻線3の周囲に同心状に配置されている外側巻線4と、を備えている。すなわち、内側巻線3は、鉄心1の径方向(鉄心1の主脚部11の軸線Lに垂直な方向)外側において巻き回されて配置されており、外側巻線4は、内側巻線3の径方向外側において巻き回されて配置されている。軸線Lは、図2に示す鉄心1の断面の中心(図心)を通り該断面に垂直な直線である。ここで、内側巻線3は低圧側巻線(二次側巻線)、外側巻線4は高圧側巻線(一次側巻線)として構成されている。 FIG. 2 is a horizontal sectional view of the vicinity of the winding 2 of the transformer 100 shown in FIG. As shown in FIG. 2, the iron core 1 is an amorphous iron core configured by laminating thin ribbons of amorphous alloy to reduce loss. For this reason, the iron core 1 has a rectangular cross section. In addition, the iron core 1 may be divided | segmented in the long side of the rectangular cross section. The winding 2 includes an inner winding 3 arranged concentrically around the main leg 11 of the iron core 1 and an outer winding 4 arranged concentrically around the inner winding 3. ing. That is, the inner winding 3 is wound and arranged on the outer side in the radial direction of the iron core 1 (direction perpendicular to the axis L of the main leg portion 11 of the iron core 1). It is wound and arranged on the outside in the radial direction. The axis L is a straight line passing through the center (centroid) of the cross section of the iron core 1 shown in FIG. 2 and perpendicular to the cross section. Here, the inner winding 3 is configured as a low voltage side winding (secondary side winding), and the outer winding 4 is configured as a high voltage side winding (primary side winding).
 内側巻線3は、鉄心1の主脚部11の軸線Lに沿う方向(鉛直方向;図2の紙面に垂直な方向)から見て、直線状に形成されている一対の平行な直線部31と、各直線部31の対向する端部同士をコーナー部32を介して接続する一対の接続部33と、を有している。また、外側巻線4は、鉄心1の主脚部11の軸線Lに沿う方向から見て、直線状に形成されている一対の平行な直線部41と、各直線部41の対向する端部同士をコーナー部42を介して接続する一対の接続部43と、を有している。本実施形態では、接続部33,43は、外に凸の円弧状に形成されている。すなわち、巻線2(内側巻線3および外側巻線4)の周回形状は、レーストラック型を呈している。 The inner winding 3 is a pair of parallel straight portions 31 formed in a straight line when viewed from a direction along the axis L of the main leg portion 11 of the iron core 1 (vertical direction; a direction perpendicular to the paper surface of FIG. 2). And a pair of connecting portions 33 that connect opposite end portions of the respective straight line portions 31 via the corner portions 32. In addition, the outer winding 4 includes a pair of parallel straight portions 41 formed in a straight line when viewed from the direction along the axis L of the main leg portion 11 of the iron core 1, and opposite end portions of the straight portions 41. And a pair of connection portions 43 that connect each other via the corner portion 42. In the present embodiment, the connecting portions 33 and 43 are formed in an outwardly convex arc shape. That is, the winding shape of the winding 2 (the inner winding 3 and the outer winding 4) is a racetrack type.
 直線部31,41は、鉄心1の矩形の断面の長辺に平行となっている。接続部33,43は、鉄心1の矩形の断面の短辺に対応する大半径を有する円弧部である。コーナー部32,42は、直線部31,41と接続部33,43との間に位置する小半径を有する円弧部である。 The straight portions 31 and 41 are parallel to the long side of the rectangular cross section of the iron core 1. The connecting portions 33 and 43 are arc portions having a large radius corresponding to the short side of the rectangular cross section of the iron core 1. The corner portions 32 and 42 are arc portions having a small radius located between the straight portions 31 and 41 and the connection portions 33 and 43.
 内側巻線3と外側巻線4との間には、内側巻線3の外周34と外側巻線4の内周44とを支持する内外巻線間支持部材(支持部材)5が配置されている。内外巻線間支持部材5は、短冊状(帯板状)を呈しており、鉄心1の主脚部11の軸線Lに沿う方向に延在している。内外巻線間支持部材5は、絶縁材料から形成されている。具体的には、内外巻線間支持部材5の材質は、例えばプレスボード(紙)であるが、これに限定されるものではなく、絶縁木、絶縁樹脂(エボナイト等)などの絶縁材料であってもよい。 Between the inner winding 3 and the outer winding 4, an inner / outer winding support member (support member) 5 that supports the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 is disposed. Yes. The support member 5 between the inner and outer windings has a strip shape (band plate shape) and extends in a direction along the axis L of the main leg portion 11 of the iron core 1. The support member 5 between the inner and outer windings is made of an insulating material. Specifically, the material of the support member 5 between the inner and outer windings is, for example, a press board (paper), but is not limited thereto, and is an insulating material such as insulating wood, insulating resin (ebonite, etc.). May be.
 内外巻線間支持部材5は、コーナー部32,42に当接するコーナー支持部材6と、直線部31,41または接続部33,43に当接するコーナー間支持部材7とを有している。コーナー支持部材6は、4箇所に位置するコーナー部32,42ごとに分離して配置されている。コーナー間支持部材7は、周方向に隣り合う2つのコーナー支持部材6の間に配置されている。なお、巻線2の周方向における隣り合う内外巻線間支持部材5(コーナー支持部材6およびコーナー間支持部材7)の間の空間は、巻線2を冷却するための絶縁性を有する油(絶縁油)が流入する油道として機能し得る。 The inner / outer winding support member 5 includes a corner support member 6 that contacts the corner portions 32 and 42 and an inter-corner support member 7 that contacts the straight portions 31 and 41 or the connection portions 33 and 43. The corner support member 6 is disposed separately for each of the corner portions 32 and 42 located at four locations. The support member 7 between corners is arrange | positioned between the two corner support members 6 adjacent to the circumferential direction. In addition, the space between the adjacent inner / outer winding support members 5 (corner support member 6 and inter-corner support member 7) in the circumferential direction of the winding 2 is an insulating oil for cooling the winding 2 ( It can function as an oil passage through which insulating oil flows.
 内側巻線3と外側巻線4との間には、例えばプレスボード等の絶縁材料から形成された筒状の絶縁筒51が配置されている。絶縁筒51は、内側巻線3と外側巻線4との間の絶縁を確保する。内外巻線間支持部材5は、絶縁筒51の内側巻線3側(内側)に配置されている内側部61,71と、絶縁筒51を間に挟んで内側部61,71の外側巻線4側(外側)に配置されている外側部62,72と、を有している。内外巻線間支持部材5が内側巻線3の外側に絶縁筒51とともにセットされた状態で、内外巻線間支持部材5上に外側巻線4が巻き回されるようになっている。 Between the inner winding 3 and the outer winding 4, a cylindrical insulating cylinder 51 made of an insulating material such as a press board is disposed. The insulating cylinder 51 ensures insulation between the inner winding 3 and the outer winding 4. The inner / outer winding support member 5 includes inner portions 61 and 71 disposed on the inner winding 3 side (inner side) of the insulating tube 51 and outer windings of the inner portions 61 and 71 with the insulating tube 51 interposed therebetween. And outer portions 62 and 72 arranged on the four sides (outside). The outer winding 4 is wound on the inner / outer winding support member 5 in a state in which the inner / outer winding support member 5 is set together with the insulating cylinder 51 outside the inner winding 3.
 鉄心1と内側巻線3との間には、内側巻線3の内周を全周にわたって支持する内側巻線支持部材8が配置されている。内側巻線支持部材8もまた、概ねレーストラック型を呈している。内側巻線支持部材8は、絶縁材料から形成されている。内側巻線支持部材8の材質としては、例えば内外巻線間支持部材5と同様の材質が使用され得る。 Between the iron core 1 and the inner winding 3, an inner winding support member 8 that supports the inner circumference of the inner winding 3 over the entire circumference is disposed. The inner winding support member 8 also has a generally racetrack shape. The inner winding support member 8 is made of an insulating material. As the material of the inner winding support member 8, for example, the same material as that of the inner / outer winding support member 5 can be used.
 図3は、変形例に係る内側巻線支持部材8aの断面図である。図3に示すように、内側巻線支持部材8aの外周には、巻線2を冷却するための絶縁油が流入する油道81が形成されている。油道81は、例えば鉛直方向(図3の紙面に垂直な方向)に延在する溝である。 FIG. 3 is a cross-sectional view of an inner winding support member 8a according to a modification. As shown in FIG. 3, an oil passage 81 into which insulating oil for cooling the winding 2 flows is formed on the outer periphery of the inner winding support member 8a. The oil passage 81 is, for example, a groove extending in the vertical direction (direction perpendicular to the paper surface of FIG. 3).
 図2に示すように、外側巻線4の直線部41の外側には、外側巻線4の直線部41の外周を支持する外側巻線支持部材9が配置されている。外側巻線支持部材9は、絶縁材料から形成されている。外側巻線支持部材9の材質としては、例えば内外巻線間支持部材5と同様の材質が使用され得る。外側巻線支持部材9の外側(外側巻線4と反対側)は、図示しない構造物によって支持されている。 As shown in FIG. 2, an outer winding support member 9 that supports the outer periphery of the straight portion 41 of the outer winding 4 is disposed outside the straight portion 41 of the outer winding 4. The outer winding support member 9 is made of an insulating material. As the material of the outer winding support member 9, for example, the same material as that of the inner / outer winding support member 5 can be used. The outer side of the outer winding support member 9 (the side opposite to the outer winding 4) is supported by a structure (not shown).
 図4は、図2に示されるコーナー支持部材6付近の拡大断面図である。図4に示すように、コーナー支持部材6は、内側巻線3の外周34におけるコーナー部32と直線部31との連結点35、および内側巻線3の外周34におけるコーナー部32と接続部33との連結点36に当接している。ここで、内側巻線3の外周34において、連結点35は、コーナー部32から直線部31に変化する変化点であり、連結点36は、コーナー部32から接続部33に変化する変化点である。 FIG. 4 is an enlarged cross-sectional view of the vicinity of the corner support member 6 shown in FIG. As shown in FIG. 4, the corner support member 6 includes a connection point 35 between the corner portion 32 and the straight portion 31 on the outer periphery 34 of the inner winding 3 and a corner portion 32 and a connection portion 33 on the outer periphery 34 of the inner winding 3. And a contact point 36. Here, on the outer periphery 34 of the inner winding 3, the connection point 35 is a change point that changes from the corner portion 32 to the straight portion 31, and the connection point 36 is a change point that changes from the corner portion 32 to the connection portion 33. is there.
 また、コーナー支持部材6は、外側巻線4の内周44におけるコーナー部42と直線部41との連結点45、および外側巻線4の内周44におけるコーナー部42と接続部43との連結点46に当接している。ここで、外側巻線4の内周44において、連結点45は、コーナー部42から直線部41に変化する変化点であり、連結点46は、コーナー部42から接続部43に変化する変化点である。 Further, the corner support member 6 includes a connection point 45 between the corner portion 42 and the straight portion 41 on the inner periphery 44 of the outer winding 4 and a connection between the corner portion 42 and the connection portion 43 on the inner periphery 44 of the outer winding 4. It is in contact with the point 46. Here, in the inner periphery 44 of the outer winding 4, the connection point 45 is a changing point where the corner portion 42 changes to the straight portion 41, and the connecting point 46 is a changing point where the corner portion 42 changes to the connecting portion 43. It is.
 次に、このように構成された変圧器100の作用について説明する。 Next, the operation of the transformer 100 configured as described above will be described.
 変圧器100の低圧側や高圧側で短絡が起きると、巻線2に大きな電流が流れることによって、内側巻線3と外側巻線4との間に大きな反発力(電磁機械力)が働く。図5は、短絡時の巻線2の変形を説明するための模式図である。図5では、説明の都合上、内側巻線3の外周34と外側巻線4の内周44とが主として示されており、コーナー支持部材6の図示を省略している。 When a short circuit occurs on the low voltage side or the high voltage side of the transformer 100, a large current flows through the winding 2, and a large repulsive force (electromagnetic mechanical force) acts between the inner winding 3 and the outer winding 4. FIG. 5 is a schematic diagram for explaining the deformation of the winding 2 at the time of a short circuit. In FIG. 5, for convenience of explanation, the outer periphery 34 of the inner winding 3 and the inner periphery 44 of the outer winding 4 are mainly shown, and the corner support member 6 is not shown.
 図5に示すように、短絡時には、内側巻線3において、直線部31および大半径を有する円弧部である接続部33が、ともに内側に変形しようとする(図5中の二点鎖線で模式的に示す)。これにより、直線部31と接続部33との間に位置する小半径を有する円弧部であるコーナー部32は、外向きに突出して折れ曲がる形で変形しようとする。また、短絡時には、外側巻線4において、直線部41および大半径を有する円弧部である接続部43が、ともに外側に変形しようとする(図5中の二点鎖線で模式的に示す)。これにより、直線部41と接続部43との間に位置する小半径を有する円弧部であるコーナー部42は、内側に倒れ込もうとする形で変形しようとする。 As shown in FIG. 5, at the time of short circuit, in the inner winding 3, both the straight portion 31 and the connecting portion 33 which is a circular arc portion having a large radius tend to be deformed inward (schematically shown by a two-dot chain line in FIG. 5). Show). Thereby, the corner part 32 which is a circular arc part which has a small radius located between the linear part 31 and the connection part 33 tends to deform | transform in the form which protrudes outward and bends. Further, at the time of short circuit, in the outer winding 4, both the straight portion 41 and the connecting portion 43 that is a circular arc portion having a large radius tend to be deformed outward (schematically indicated by a two-dot chain line in FIG. 5). Thereby, the corner part 42 which is a circular arc part which has a small radius located between the linear part 41 and the connection part 43 tends to deform | transform so that it may fall down inside.
 すなわち、短絡時には、コーナー部32,42では、内側巻線3と外側巻線4とが互いに近付く方向に変形しようとする。このとき、コーナー部32,42、特に連結点35,36,45,46(図4参照)において、応力集中によって大きな応力が発生する。発生応力が許容応力を超えると、過度な変形が生じてしまい、短絡が解消した後でも永久変形(塑性変形)が残ってしまうおそれがある。 That is, at the time of a short circuit, the corner portions 32 and 42 tend to deform in a direction in which the inner winding 3 and the outer winding 4 approach each other. At this time, a large stress is generated by the stress concentration at the corner portions 32 and 42, particularly at the connection points 35, 36, 45, and 46 (see FIG. 4). If the generated stress exceeds the allowable stress, excessive deformation occurs, and permanent deformation (plastic deformation) may remain even after the short circuit is resolved.
 本実施形態では、内側巻線3と外側巻線4との間にコーナー支持部材6(図2、図4参照)を配置することによって、内側巻線3のコーナー部32および外側巻線4のコーナー部42の変形を互いに抑制する機能が発揮される。 In the present embodiment, the corner support member 6 (see FIGS. 2 and 4) is disposed between the inner winding 3 and the outer winding 4, so that the corner portion 32 and the outer winding 4 of the inner winding 3 are arranged. The function of suppressing the deformation of the corner portions 42 is exhibited.
 図6は、巻線2の曲率半径比と短絡時発生応力との関係を示すグラフである。図6における横軸は、外側巻線4の外周におけるコーナー部42の曲率半径R1(図2参照)と接続部43の曲率半径R2(図2参照)との比(曲率半径比)Pを示す。また、図6における縦軸は、短絡時に巻線2に発生する最大応力σを示す。なお、図6では、曲率半径比Pは、比の値で示されている。 FIG. 6 is a graph showing the relationship between the curvature radius ratio of the winding 2 and the stress generated at the time of short circuit. 6 represents the ratio (curvature radius ratio) P between the curvature radius R1 (see FIG. 2) of the corner portion 42 and the curvature radius R2 (see FIG. 2) of the connection portion 43 on the outer periphery of the outer winding 4. . Further, the vertical axis in FIG. 6 indicates the maximum stress σ generated in the winding 2 at the time of short circuit. In FIG. 6, the curvature radius ratio P is indicated by a ratio value.
 図6に示すように、コーナー部42の曲率半径R1が小さすぎると、短絡時に発生する最大応力σが過大となる。また、コーナー部42の曲率半径R1が大きすぎても、短絡時に発生する最大応力σが大きくなる傾向にある。より具体的には、図6に示すように、短絡時に発生する最大応力σは、曲率半径比Pが1:7から1:4の範囲でかなり低くなっているとともに、曲率半径比Pが1:5で極小となっている。つまり、最大応力σは、曲率半径比Pが1:7から1:5に向かうに従って僅かに低下し、曲率半径比Pが1:5から1:4に向かうに従って僅かに増大する。したがって、曲率半径比Pは、1:4から1:7の範囲内にあることが好ましいと言える。 As shown in FIG. 6, when the radius of curvature R1 of the corner portion 42 is too small, the maximum stress σ generated at the time of short circuit becomes excessive. Even if the radius of curvature R1 of the corner portion 42 is too large, the maximum stress σ generated at the time of short circuit tends to increase. More specifically, as shown in FIG. 6, the maximum stress σ generated at the time of short circuit is considerably low when the radius-of-curvature ratio P is in the range of 1: 7 to 1: 4, and the radius-of-curvature ratio P is 1. : 5 is minimum. That is, the maximum stress σ slightly decreases as the curvature radius ratio P goes from 1: 7 to 1: 5, and slightly increases as the curvature radius ratio P goes from 1: 5 to 1: 4. Therefore, it can be said that the curvature radius ratio P is preferably in the range of 1: 4 to 1: 7.
 前記したように、本実施形態に係る変圧器100は、矩形の断面を有する鉄心1と、周回形状がレーストラック型を呈する内側巻線3および外側巻線4と、を備えている。そして、内側巻線3と外側巻線4との間には、内側巻線3の外周34と外側巻線4の内周44とを支持する内外巻線間支持部材5が配置されており、内外巻線間支持部材5は、コーナー部32,42に当接するコーナー支持部材6を有している。 As described above, the transformer 100 according to the present embodiment includes the iron core 1 having a rectangular cross section, and the inner winding 3 and the outer winding 4 that have a racetrack shape as a circular shape. Between the inner winding 3 and the outer winding 4, an inner / outer winding support member 5 that supports the outer circumference 34 of the inner winding 3 and the inner circumference 44 of the outer winding 4 is disposed, The inner / outer winding support member 5 includes a corner support member 6 that abuts against the corner portions 32 and 42.
 このような本実施形態によれば、短絡時に内側巻線3と外側巻線4との間に大きな反発力(電磁機械力)が働く場合でも、互いに近付くように変形して大きな応力を発生しがちな内側巻線3のコーナー部32および外側巻線4のコーナー部42を、コーナー支持部材6によって支持することができる。このため、内側巻線3のコーナー部32および外側巻線4のコーナー部42の変形を互いに抑制することができ、ひいては巻線2全体の過度な変形を抑制することができる。 According to this embodiment, even when a large repulsive force (electromagnetic mechanical force) acts between the inner winding 3 and the outer winding 4 at the time of a short circuit, it deforms so as to approach each other and generates a large stress. The corner portion 32 of the inner winding 3 and the corner portion 42 of the outer winding 4 that are likely to be supported can be supported by the corner support member 6. For this reason, the deformation | transformation of the corner part 32 of the inner side winding 3 and the corner part 42 of the outer side winding 4 can be mutually suppressed, and the excessive deformation | transformation of the whole winding 2 can also be suppressed by extension.
 すなわち、矩形の断面を有する鉄心1を備える変圧器100において短絡時の巻線2の変形をより抑制することができる。これにより、短絡時の巻線2の過度な変形によってインピーダンス等の特性が悪化することを抑制することができる。また、本実施形態では、コーナー支持部材6は、内側巻線3の外周34における連結点35,36と、外側巻線4の内周44における連結点45,46とに当接している。このような構成によれば、特に応力集中が生じやすい巻線2の連結点35,36,45,46がコーナー支持部材6によって支持されるため、応力集中が緩和される。したがって、短絡時の巻線2の変形をさらに抑制することができる。また、本実施形態では、外側巻線4の外周におけるコーナー部42の曲率半径R1と接続部43の曲率半径R2との比(曲率半径比)Pが1:4から1:7の範囲内にある。 That is, in the transformer 100 including the iron core 1 having a rectangular cross section, the deformation of the winding 2 at the time of a short circuit can be further suppressed. Thereby, it can suppress that characteristics, such as an impedance, deteriorate by the excessive deformation | transformation of the coil | winding 2 at the time of a short circuit. In this embodiment, the corner support member 6 is in contact with the connection points 35 and 36 on the outer periphery 34 of the inner winding 3 and the connection points 45 and 46 on the inner periphery 44 of the outer winding 4. According to such a configuration, the connection points 35, 36, 45, 46 of the winding 2, which are particularly prone to stress concentration, are supported by the corner support member 6, so that stress concentration is reduced. Therefore, the deformation of the winding 2 at the time of a short circuit can be further suppressed. In the present embodiment, the ratio P (curvature radius ratio) P between the curvature radius R1 of the corner portion 42 and the curvature radius R2 of the connection portion 43 on the outer periphery of the outer winding 4 is in the range of 1: 4 to 1: 7. is there.
 このような構成によれば、短絡時に巻線2に発生する最大応力σをより低くすることができる。したがって、短絡時の巻線2の変形をさらに抑制することができる。また、本実施形態では、内外巻線間支持部材5は、絶縁筒51の内側巻線3側に配置されている内側部61,71と、絶縁筒51を間に挟んで内側部61,71の外側巻線4側に配置されている外側部62,72と、を有している。このような構成によれば、絶縁筒51の内外に内側部61,71および外側部62,72をそれぞれ配置することによって、内側巻線3と外側巻線4との間の絶縁を確保しつつ、内外巻線間支持部材5の設置の作業性を向上させることができる。さらに、絶縁筒51の内外における内外巻線間支持部材5が配置されていない空間を、巻線2を冷却するための絶縁油が流入する油道として機能させることができる。 According to such a configuration, the maximum stress σ generated in the winding 2 at the time of a short circuit can be further reduced. Therefore, the deformation of the winding 2 at the time of a short circuit can be further suppressed. In the present embodiment, the support member 5 between the inner and outer windings has the inner portions 61 and 71 disposed on the inner winding 3 side of the insulating tube 51 and the inner portions 61 and 71 with the insulating tube 51 interposed therebetween. And outer portions 62 and 72 arranged on the outer winding 4 side. According to such a configuration, the inner portions 61 and 71 and the outer portions 62 and 72 are respectively disposed inside and outside the insulating cylinder 51, thereby ensuring insulation between the inner winding 3 and the outer winding 4. The workability of installing the support member 5 between the inner and outer windings can be improved. Furthermore, the space in which the supporting member 5 between the inner and outer windings inside and outside the insulating cylinder 51 is not disposed can function as an oil passage through which insulating oil for cooling the winding 2 flows.
 また、本実施形態では、鉄心1と内側巻線3との間に、内側巻線3の内周を全周にわたって支持する内側巻線支持部材8が配置されている。このような構成によれば、短絡時に内側巻線3を鉄心1(内側)に変形させようとする電磁機械力に抗して、内側巻線3を確実に支持することができる。したがって、短絡時の内側巻線3の変形をさらに抑制することができる。 In this embodiment, an inner winding support member 8 that supports the inner circumference of the inner winding 3 over the entire circumference is disposed between the iron core 1 and the inner winding 3. According to such a configuration, it is possible to reliably support the inner winding 3 against an electromagnetic mechanical force that attempts to deform the inner winding 3 into the iron core 1 (inner side) at the time of a short circuit. Therefore, deformation of the inner winding 3 at the time of short circuit can be further suppressed.
 また、本実施形態では、内側巻線支持部材8aの外周に油道81を形成することが好ましい。このようにすれば、巻線2をより効果的に冷却することができる。また、本実施形態では、外側巻線4の直線部41の外側に、外側巻線4の直線部41の外周を支持する外側巻線支持部材9が配置されている。このような構成によれば、外側巻線支持部材9は、短絡時に外側巻線4を外側に変形させようとする電磁機械力に抗して、外側巻線4の直線部41を確実に支持することができる。したがって、短絡時の外側巻線4の変形をさらに抑制することができる。
(第2実施形態)
 次に、図7を参照しながら、本発明の第2実施形態について、前記した第1実施形態と相違する点を中心に説明し、共通する点の説明を省略する。
In the present embodiment, it is preferable to form the oil passage 81 on the outer periphery of the inner winding support member 8a. If it does in this way, the coil | winding 2 can be cooled more effectively. In the present embodiment, the outer winding support member 9 that supports the outer periphery of the linear portion 41 of the outer winding 4 is disposed outside the linear portion 41 of the outer winding 4. According to such a configuration, the outer winding support member 9 reliably supports the linear portion 41 of the outer winding 4 against an electromagnetic mechanical force that attempts to deform the outer winding 4 outward during a short circuit. can do. Therefore, the deformation of the outer winding 4 at the time of a short circuit can be further suppressed.
(Second Embodiment)
Next, with reference to FIG. 7, the second embodiment of the present invention will be described with a focus on differences from the first embodiment described above, and descriptions of common points will be omitted.
 図7は、本発明の第2実施形態に係るコーナー支持部材6a付近の拡大断面図である。図7に示すように、コーナー支持部材6aは、巻線2(内側巻線3および外側巻線4)の周方向に分割されており、第1部材63と、第2部材64とを有している。 FIG. 7 is an enlarged cross-sectional view of the vicinity of the corner support member 6a according to the second embodiment of the present invention. As shown in FIG. 7, the corner support member 6 a is divided in the circumferential direction of the winding 2 (the inner winding 3 and the outer winding 4), and has a first member 63 and a second member 64. ing.
 第1部材63は、内側巻線3の外周34におけるコーナー部32と直線部31との連結点35、および外側巻線4の内周44におけるコーナー部42と直線部41との連結点45に当接している。また、第2部材64は、内側巻線3の外周34におけるコーナー部32と接続部33との連結点36、および外側巻線4の内周44におけるコーナー部42と接続部43との連結点46に当接している。 The first member 63 has a connection point 35 between the corner portion 32 and the straight portion 31 on the outer periphery 34 of the inner winding 3 and a connection point 45 between the corner portion 42 and the straight portion 41 on the inner periphery 44 of the outer winding 4. It is in contact. Further, the second member 64 includes a connection point 36 between the corner portion 32 and the connection portion 33 on the outer periphery 34 of the inner winding 3 and a connection point between the corner portion 42 and the connection portion 43 on the inner periphery 44 of the outer winding 4. 46 abuts.
 第1実施形態のコーナー支持部材6は、図4に示すように巻線2の周方向(短冊状のコーナー支持部材6の幅方向)における長さ寸法が長いため、例えばプレスボード(紙)で製作する場合に、巻線2の周方向に沿って湾曲した形状に形成することは困難を要する。これに対して、第2実施形態のコーナー支持部材6aは、第1部材63と第2部材64とに分割されている。 The corner support member 6 of the first embodiment has a long length in the circumferential direction of the winding 2 (the width direction of the strip-shaped corner support member 6) as shown in FIG. When manufacturing, it is difficult to form a curved shape along the circumferential direction of the winding 2. On the other hand, the corner support member 6a of the second embodiment is divided into a first member 63 and a second member 64.
 このような第2実施形態によれば、コーナー支持部材6aは、巻線2の周方向における長さ寸法が短いため、湾曲した形状に形成する必要が殆どなくなり、製作が容易となる。また、巻線2の周方向における第1部材63と第2部材64との間の空間を、巻線2を冷却するための絶縁油が流入する油道として機能させることができる。
(第3実施形態)
 次に、図8を参照しながら、本発明の第3実施形態について、前記した第1実施形態と相違する点を中心に説明し、共通する点の説明を省略する。
According to the second embodiment, since the corner support member 6a has a short length in the circumferential direction of the winding 2, it is hardly necessary to form the curved shape, and the manufacture becomes easy. In addition, the space between the first member 63 and the second member 64 in the circumferential direction of the winding 2 can function as an oil passage through which insulating oil for cooling the winding 2 flows.
(Third embodiment)
Next, with reference to FIG. 8, the third embodiment of the present invention will be described with a focus on differences from the first embodiment described above, and description of common points will be omitted.
 図8は、本発明の第3実施形態に係る変圧器の巻線2a付近の水平断面図である。図8に示すように、第3実施形態では、接続部33a,43aは、直線状に形成されている。すなわち、巻線2a(内側巻線3aおよび外側巻線4a)の周回形状は、角型を呈している。また、内側巻線支持部材8bも、角型を呈している。 FIG. 8 is a horizontal sectional view of the vicinity of the winding 2a of the transformer according to the third embodiment of the present invention. As shown in FIG. 8, in the third embodiment, the connecting portions 33a and 43a are formed in a straight line. That is, the winding shape of the winding 2a (the inner winding 3a and the outer winding 4a) is a square shape. The inner winding support member 8b also has a square shape.
 外側巻線4aの直線状の接続部43aの外側には、外側巻線4aの接続部43aの外周を支持する外側巻線支持部材9aが配置されている。外側巻線支持部材9aは、絶縁材料から形成されている。外側巻線支持部材9aの材質としては、例えば内外巻線間支持部材5と同様の材質が使用され得る。外側巻線支持部材9aの外側(外側巻線4aと反対側)は、図示しない構造物によって支持されている。 An outer winding support member 9a that supports the outer periphery of the connecting portion 43a of the outer winding 4a is disposed outside the linear connecting portion 43a of the outer winding 4a. The outer winding support member 9a is made of an insulating material. As the material of the outer winding support member 9a, for example, the same material as that of the inner / outer winding support member 5 can be used. The outer side of the outer winding support member 9a (the side opposite to the outer winding 4a) is supported by a structure (not shown).
 このような第3実施形態によれば、前記した第1実施形態と同様な作用効果を奏することができる。すなわち、本発明は、矩形の断面を有する鉄心1と、周回形状が角型を呈する巻線2a(内側巻線3aおよび外側巻線4a)と、を備える変圧器にも適用できる。 According to the third embodiment, it is possible to achieve the same operational effects as those of the first embodiment. In other words, the present invention can also be applied to a transformer including an iron core 1 having a rectangular cross section and a winding 2a (inner winding 3a and outer winding 4a) whose circular shape is a square shape.
 また、特高クラスの容量の変圧器の場合、短絡時に外側巻線4aの直線状の接続部43aを外側に変形させる方向に電磁機械力が大きく作用するが、外側巻線支持部材9aが過大な電磁機械力に抗して、外側巻線4aの接続部43aを確実に支持することができる。ただし、比較的小さい容量の変圧器の場合、外側巻線支持部材9aは省略されてもよい。 Further, in the case of a transformer with an extra high-class capacity, an electromagnetic mechanical force acts greatly in the direction of deforming the linear connection portion 43a of the outer winding 4a to the outside during a short circuit, but the outer winding support member 9a is excessive. It is possible to reliably support the connecting portion 43a of the outer winding 4a against strong electromagnetic mechanical force. However, in the case of a transformer having a relatively small capacity, the outer winding support member 9a may be omitted.
 以上、本発明について実施形態に基づいて説明したが、本発明は前記した実施形態や変形例に限定されるものではなく、更なる様々な変形例が含まれる。例えば、前記した実施形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。また、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。例えば、前記実施形態では、単相三脚型の変圧器100について説明したが、本発明はこれに限定されるものではなく、例えば三相五脚型の変圧器にも適用可能である。 As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to above-described embodiment and modification, Further various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. For example, in the above-described embodiment, the single-phase tripod transformer 100 has been described. However, the present invention is not limited to this, and can be applied to, for example, a three-phase five-leg transformer.
 また、前記実施形態では、変圧器100について説明したが、本発明はこれに限定されるものではなく、例えばリアクトルなどの他の静止誘導電器にも適用可能である。また、前記第1実施形態では、巻線2(内側巻線3および外側巻線4)の接続部33,43は、外に凸の円弧状に形成されているが、必ずしも厳密な円弧状である必要はなく、例えば楕円弧等の曲線状であってもよい。また、前記第2実施形態では、コーナー支持部材6aは、巻線2の周方向に、第1部材63と第2部材64とに2つに分割されているが(図7参照)、これに限定されるものではなく、3つ以上に分割されていてもよい。また、前記実施形態では、コーナー間支持部材7は、周方向に隣り合う2つのコーナー支持部材6の間に、1つ配置されているが(図2、図8参照)、これに限定されるものではなく、複数個配置されていてもよく、あるいは配置を省略することも可能である。 In the above embodiment, the transformer 100 has been described. However, the present invention is not limited to this, and can also be applied to other stationary induction devices such as a reactor. In the first embodiment, the connecting portions 33 and 43 of the winding 2 (the inner winding 3 and the outer winding 4) are formed in an outwardly convex arc shape. There is no need, for example, a curved shape such as an elliptical arc may be used. Further, in the second embodiment, the corner support member 6a is divided into the first member 63 and the second member 64 in the circumferential direction of the winding 2 (see FIG. 7). It is not limited and may be divided into three or more. Moreover, in the said embodiment, although the one corner support member 7 is arrange | positioned between the two corner support members 6 adjacent to the circumferential direction (refer FIG. 2, FIG. 8), it is limited to this. A plurality of them may be arranged, or the arrangement may be omitted.
 1     鉄心
 2,2a  巻線
 3,3a  内側巻線
 4,4a  外側巻線
 5     内外巻線間支持部材(支持部材)
 6,6a  コーナー支持部材
 7     コーナー間支持部材
 8,8a,8b 内側巻線支持部材
 9,9a  外側巻線支持部材
 11    主脚部
 12    側脚部
 31,41 直線部
 32,42 コーナー部
 33,33a,43,43a 接続部
 34    外周
 35,36,45,46 連結点
 44    内周
 51    絶縁筒
 61,71 内側部
 62,72 外側部
 63    第1部材
 64    第2部材
 81    油道
 100   変圧器
 L     軸線
1 Iron core 2, 2a Winding 3, 3a Inner winding 4, 4a Outer winding 5 Support member between inner and outer winding (support member)
6, 6a Corner support member 7 Inter-corner support member 8, 8a, 8b Inner winding support member 9, 9a Outer winding support member 11 Main leg portion 12 Side leg portion 31, 41 Linear portion 32, 42 Corner portion 33, 33a , 43, 43a Connection portion 34 Outer periphery 35, 36, 45, 46 Connection point 44 Inner periphery 51 Insulating cylinder 61, 71 Inner portion 62, 72 Outer portion 63 First member 64 Second member 81 Oil passage 100 Transformer L Axis

Claims (8)

  1.  矩形の断面を有する鉄心と、
     前記鉄心の周囲に同心状に配置されている内側巻線と、
     前記内側巻線の周囲に同心状に配置されている外側巻線と、
     前記内側巻線と前記外側巻線との間に配置され、前記内側巻線の外周と前記外側巻線の内周とを支持する絶縁材料から形成された支持部材と、を備え、
     前記内側巻線および前記外側巻線は、前記鉄心の軸線に沿う方向から見て、直線状に形成されている一対の平行な直線部と、各直線部の対向する端部同士をコーナー部を介して接続する一対の接続部と、をそれぞれ有し、
     前記接続部は、直線状または外に凸の曲線状に形成されており、
     前記支持部材は、前記コーナー部に当接するコーナー支持部材を有することを特徴とする静止誘導電器。
    An iron core having a rectangular cross section;
    An inner winding arranged concentrically around the iron core;
    An outer winding disposed concentrically around the inner winding;
    A support member that is disposed between the inner winding and the outer winding and formed of an insulating material that supports the outer periphery of the inner winding and the inner periphery of the outer winding;
    The inner winding and the outer winding have a pair of parallel straight portions formed in a straight line when viewed from the direction along the axis of the iron core, and corner portions that face each other of the straight portions. Each having a pair of connection portions connected via
    The connection part is formed in a straight line shape or an outwardly convex curve shape,
    The stationary induction device, wherein the support member includes a corner support member that contacts the corner portion.
  2.  前記コーナー支持部材は、前記内側巻線の外周におけるコーナー部と直線部との連結点、前記内側巻線の外周におけるコーナー部と接続部との連結点、前記外側巻線の内周におけるコーナー部と直線部との連結点、および前記外側巻線の内周におけるコーナー部と接続部との連結点に当接することを特徴とする請求項1に記載の静止誘導電器。 The corner support member includes a connection point between a corner portion and a straight portion on the outer periphery of the inner winding, a connection point between a corner portion and a connection portion on the outer periphery of the inner winding, and a corner portion on the inner periphery of the outer winding. 2. The stationary induction device according to claim 1, wherein the stationary induction device is in contact with a connection point between the first and second straight portions and a connection point between the corner portion and the connection portion in the inner periphery of the outer winding.
  3.  前記コーナー支持部材は、前記内側巻線および前記外側巻線の周方向に分割されており、前記内側巻線の外周におけるコーナー部と直線部との連結点、および前記外側巻線の内周におけるコーナー部と直線部との連結点に当接する第1部材と、前記内側巻線の外周におけるコーナー部と接続部との連結点、および前記外側巻線の内周におけるコーナー部と接続部との連結点に当接する第2部材と、を少なくとも有することを特徴とする請求項2に記載の静止誘導電器。 The corner support member is divided in a circumferential direction of the inner winding and the outer winding, and a connection point between a corner portion and a straight portion in the outer periphery of the inner winding, and in an inner periphery of the outer winding. A first member that abuts a connection point between the corner portion and the straight portion; a connection point between the corner portion and the connection portion on the outer periphery of the inner winding; and a corner portion and a connection portion on the inner periphery of the outer winding. The static induction machine according to claim 2, further comprising at least a second member that abuts the connection point.
  4.  前記接続部は、外に凸の円弧状に形成されており、
     前記外側巻線の外周におけるコーナー部の曲率半径と接続部の曲率半径との比が1:4から1:7の範囲内にあることを特徴とする請求項1に記載の静止誘導電器。
    The connecting portion is formed in an outwardly convex arc shape,
    The static induction machine according to claim 1, wherein the ratio of the radius of curvature of the corner portion and the radius of curvature of the connecting portion in the outer periphery of the outer winding is in the range of 1: 4 to 1: 7.
  5.  前記内側巻線と前記外側巻線との間に、絶縁材料から形成された筒状の絶縁筒が配置されており、
     前記支持部材は、前記絶縁筒の前記内側巻線側に配置されている内側部と、前記絶縁筒を間に挟んで前記内側部の前記外側巻線側に配置されている外側部と、を有することを特徴とする請求項1に記載の静止誘導電器。
    Between the inner winding and the outer winding, a cylindrical insulating cylinder made of an insulating material is disposed,
    The support member includes an inner portion disposed on the inner winding side of the insulating tube, and an outer portion disposed on the outer winding side of the inner portion with the insulating tube interposed therebetween. The static induction device according to claim 1, comprising:
  6.  前記鉄心と前記内側巻線との間に、前記内側巻線の内周を全周にわたって支持する絶縁材料から形成された内側巻線支持部材が配置されていることを特徴とする請求項1に記載の静止誘導電器。 The inner winding support member formed from the insulating material which supports the inner periphery of the said inner side winding over the perimeter is arrange | positioned between the said iron core and the said inner side winding. The static induction machine described.
  7.  前記内側巻線支持部材の外周に、絶縁性を有する油が流入する油道が形成されていることを特徴とする請求項6に記載の静止誘導電器。 The static induction device according to claim 6, wherein an oil passage through which insulating oil flows is formed on an outer periphery of the inner winding support member.
  8.  前記外側巻線の直線部の外側に、前記外側巻線の直線部の外周を支持する絶縁材料から形成された外側巻線支持部材が配置されていることを特徴とする請求項1に記載の静止誘導電器。 The outer winding support member made of an insulating material that supports the outer periphery of the linear portion of the outer winding is disposed outside the linear portion of the outer winding. Static induction machine.
PCT/JP2017/001623 2016-03-09 2017-01-19 Stationary induction electrical apparatus WO2017154361A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128165A (en) * 1974-03-29 1975-10-08
JPS5516419A (en) * 1978-07-21 1980-02-05 Hitachi Ltd Core type transformer
JPS5615011A (en) * 1979-07-18 1981-02-13 Toshiba Corp Coil for electric device and manufacture thereof
JPS57196503A (en) * 1981-05-28 1982-12-02 Takaoka Ind Ltd Rectangular bobbin
JPH0837112A (en) * 1994-07-22 1996-02-06 Gifu Aichi Denki Kk Cooling device for transformer coil
JP2000228316A (en) * 1999-02-08 2000-08-15 Hitachi Ltd Transformer winding

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50128165A (en) * 1974-03-29 1975-10-08
JPS5516419A (en) * 1978-07-21 1980-02-05 Hitachi Ltd Core type transformer
JPS5615011A (en) * 1979-07-18 1981-02-13 Toshiba Corp Coil for electric device and manufacture thereof
JPS57196503A (en) * 1981-05-28 1982-12-02 Takaoka Ind Ltd Rectangular bobbin
JPH0837112A (en) * 1994-07-22 1996-02-06 Gifu Aichi Denki Kk Cooling device for transformer coil
JP2000228316A (en) * 1999-02-08 2000-08-15 Hitachi Ltd Transformer winding

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